Grape rot

Many vine diseases also affect the grapes of the vine, whereby these are often the effects of various diseases with different causes and pathogens (microorganisms). These can also occur in combination. It is therefore a group with the common feature of grapes affected by rot. Depending on the pathogen, the different forms or types of rot are also labelled with the corresponding colours (e.g. green rot - see below). This group also includes botrytis (grey rot), which is even expressly desired in the production of noble sweet wines.

Causes

Rot of grapes is caused by various microorganisms such as bacteria, yeasts and moulds. A distinction is made between primary infestation of healthy berries by Aspergillus, Botrytis, Cladosporium, Penicillium and Trichothecium, and secondary infestation by harmful birds, insects and weather (hail, rain, lightning) or berries damaged by primary infestation. Vinegar rot can also occur on the damaged berries. Grape rot is also favoured by a lack of nutrients in the vine during growth, such as nitrogen. Compact, dense-berried grapes are particularly at risk.

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